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Technical characteristics

The soldering process of all brass grades is characterized by the fact that there is always an oxide film on the surface of the alloy, and the process itself is accompanied by evaporation of zinc, which occurs during the heating of brass products. It is established that the surface oxide film on brass, which contains up to 15% Zn, is a copper dioxide with embedded in it particles of oxide ZnO. This film is removed in the etching process. However, in zinc-rich copper alloys, the surface oxide layer consists mainly of ZnO, the removal of which is technologically much more difficult.

Flux

In low-temperature soldering of brass parts with tin-lead solders, rosin-alcohol fluxes are ineffective. For example, zinc chloride fluxes are required for soldering of LS59-1 or L63. Supplier Evek GmbH offers to buy solder tin at an affordable price in a wide range. Provide product delivery anywhere in the continent. The price is optimal.

Strength Limit

Brass dissolves in tin-lead solder melts less actively than copper. Therefore, when brazing brass products, intermetallide layers grow noticeably slower. This has a negative effect on the mechanical properties of brazed joints. For example, the ultimate strength of butt-soldered copper joints soldered with tin is 90 MPa, and brass joints - 59 MPa.

Process conditions of soldering

Soldering of brass with low-temperature solders containing tin is used much more often. The point is that at high temperature brazing of brass (for example, in furnaces, where there is a reducing or neutral atmosphere) intensive evaporation of zinc is observed. Therefore, brazing of brasses in gas environments can only be carried out after pretreatment of the brazing places with appropriate fluxes. Without flux, brazing of brass parts in the furnace is only possible if the alloy is previously covered with a layer of copper or nickel, which protect the surface from evaporation of zinc.

High temperature brazing

At temperatures of 850... 870 °C brass parts can also be brazed in a heated salt solution. In order to improve the flow of solder in the gap, in the baths with the solution must be at least 4 ... 5% flux, which includes potassium fluoroborate or borax. If you use high-temperature brazing brass by gas burners, tin solders are rarely used, as at high temperatures, evaporation and oxidation of zinc is more intense, and the porosity of the seam increases.

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